class Ideone
{
	private static boolean validDate(String date) {
 
		String[] parts = date.split("-");
		if (parts.length != 3) return false;
 
		if (parts[0].length() != 2) return false;
		int day = Integer.parseInt(parts[0]);
		if (day < 1 || day > 31) return false;
 
		if (parts[1].length() != 2) return false;
		int month = Integer.parseInt(parts[1]);
		if (month < 1 || month > 12) return false;
 
		if (parts[2].length() != 2) return false;
		int year = Integer.parseInt(parts[2]);
 
		return true;
	}
 
	private static void test(String date) {
		String valid = validDate(date) ? "is" : "isn't";
		System.out.println(date + " " + valid + " a valid date.");
	}
 
	public static void main (String[] args) throws java.lang.Exception
	{
		test("34-12-00");
		test("31-12-dd");
	}
}

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